Electric alarm-clock.



Patented July I, I902. 2. H. KEVDRKIAN.

ELECTRIC LARK CLOCK.

(Application filed Feb. 12, 1901.)

(N0 Modal.)

WITNESSES m T m V w A TTOHNE Y UNITED STATES PATENT OFFICE.

ZAREII I-I. KEVORKIAN, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC ALARM GLOGK.

SPECIFICATION forming part of Letters Patent No. 703,425, dated July 1,1902. I

Application filed February 12, 1901. Serial No. 46,977. (No model.)

To (0Z5 whom, it may concern:

Be it known that I, ZAREH H. KEVORKIAN, a subject of the Sultan ofTurkey, residing in the city and county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inElectric Alarm- Clocks, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings,forming a part of this specification.

This invention relates to electric alarmclocks; and it has for its objeet to provide in such a mechanis ma novel construction and organizationof devices whereby simplicity and ease of setting are combined withaccuracy and efficiency of operation, as will be hereinafterparticularly described and claimed.

In the drawings, Figure 1 is a front elevation of my improvedalarm-clock, showing the key in position in dotted lines. Fig. 2 is avertical section, as on the line 2 2 of Fig. 1, showing the framework"only of the clockmovement. Fig. 3 is a sectional detail, as on the line33 of Fig. 2.' Fig. sis a detail, enlarged, of the hour-hand. Fig. 5 isa'view of the key.

A represents a suit-able casing in which the clock-movement iscontained; B, the framework of the movement; 0, a dial, ofnon-conducting material, affixed to the posts I) of the frame, and D Dthe arbors for the hour and minute hands 01 d, respectively. Rotatablyfitted within the central aperture of the dial and out of contact withthe arbors is the hub c of a spur-Wheel E, which lies exteriorly of thedial. This wheel is maintained in place by a centrally perforated cap orplate 6', which is affixed to the hub so as to take frictionally againstthe inner face of the dial. On the spur-wheel is an arm F, which extendsadjacent to the divisions of time on the dial, whereby by the turning ofthe wheel the arm may be set to any predetermined division indicated onthe dial. In the dial adjacent the spur-Wheel are orifices c, in eitherof which may be inserted the barrel of a key G of novel construction.This key is provided at or near the barrel with gear-teeth g, adapted tomesh with those of the spur-wheel E, and thereby facilitate the settingof the arm F. One of the orifices is provided with the usual stem 1) forthe winding of the clock-spring,

the key being preferably formed at its outer extremity with a socket g,which may be applied to such stem to effect the winding of the spring.

011 the under side of the hour-hand d, near the free end thereof, is anantifriction-roller II, which is adapted at a predetermined interval tobear upon the arm F and make electrical contact therewith. To regulateto a nicety the contact of theroller with the arm, I journal the rollerin the free end of a flat spring 7L, that is fastened at its oppositeend to the hour-hand, and I provide such hand with a set screw 7L, thatbears upon the spring. Hence by manipulating the screw delicateadjustment of the roller in respect to the plane of the arm F may beeffected.

Affixed to the inner face of the dial is a series of spring-fingers I,which bear yieldingly against the cap of the wheel E to make goodelectrical contact therewith. These lingers are connected bywires i, asindicated, and are included in an electric circuit, the conductors 1; t"of which are secured to one of these fingers and to the metallicclock-frame, respectively. lVhile a single spring-finger may be used, Iprefer to use several, so as to insure proper electrical contact.

In the electric circuit is included an electric alarm-bell J and also asuitable switch j.

By the construction above described it will be seen that if the arm F beset to the division of time when it is desired to sound an alarm and theswitch be turned to active position the roller II on the hour-hand willupon reaching the time indicated ride upon and make electric contactwith the arm, thereby completing the electric circuit and effecting thesounding of an alarm. As the bell will continue to ring as long as thecontact is made, I preferably provide the arm with a lateral extension fin the path of the contactroller, so that to stop the alarm within acertain interval of time it is necessary to move the switch to break theelectric circuit.

I claim 1. In an alarm-clock of the character described, the combinationof the hour-hand, the dial, the arm in the path of said hand, thecentral spur-wheel carrying said arm, the key provided with teethadapted to engage those of the spur-wheel, a contact-spring bearingagainst said Wheel, the electric alarm, and the normally broken circuittherefor connected with said contact-spring and with the clock-movement,substantially as described.

2. In an alarm-clock of the character described, the combination of thehour-hand, the apertured dial, the arm in the path of said hand, thecentral spur-wheel carrying said arm, the separate key adapted to befitted to the electric alarm, the normally broken circuit therefor, asetting-arm in said circuit, a spur-wheel carrying said arm, and atoothed key for engaging and turning said spur-Wheel, substantially asdescribed.

4:. In an alarm-clock of the character described, the combination withthe hour-hand, the dial of non-conducting material, the arm in the pathof said hand, the central wheel or support for said arm, acontact-spring affixcd to the dial and bearing against said wheel orsupport, the electric alarm, and the normally broken circuit thereforconnected with said contact-spring and with the cloclomovement,substantially as described.

In testimony whereof I have hereunto affixed my signature in thepresence of two subscribing witnesses.

ZAREII II. KEVORKIAN.

Vitnesses:

JOHN R. NOLAN, ANDREW V. GnoUPn.

